Device for toe approximation of a



A. F. POTT Jan. 7, 1941.

DEVICE FOR THE APPROXIMATION 0F A'VALUE 12 Sheets-Sheet 1 Original Filed Aug. 8, 193.5.

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DEVICE FOR THE APPROXIMA'I'ION OF A VALUE Original Filed Aug. 8, 1955 12 Sheets-Shet 2 A. F. POTT DEVICE FOR THE APPROXIMATION OF A VALUE l2 Sheets-s Original Filed Aug. 8, 1935 in" I l.

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DEVICE FOR THE APPROXIMATI ON OF A VALUE Original Filed Aug. 8, 1935 12 Sheets-Sheet 5 Jan. 7, 1941. A. F. POTT DEVICE FOR THE APPROXIMA'I.ION OF A VALUE Original Filed Aug. 8, 1935 12 Sheets-Sheet e Jan. 7, 1941. A. F. POTT DEVICE FOR THE APPROXIMATION OF A VALUE Original Filed Aug. 8, 1955 12 Sheets-Sheet 7 a g: M Ami Jan. 7, 1941. A. F. PO'IT DEVICE FOR THE APPROXIMATION OF A VALUE I Original Filed Aug. 8, 1935 12 Sheets-Sheet 8 Jan. 7, 1941. -r 2,228,035

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DEVICE FOR THE- APPROXIMATlON OF A VALUE Original Filed Aug. 8, 1935 12 Sheets-She et 1O i No. 35,389, flled Aug. 8, 1935, and of which the vthe parts located on the left hand side for the. 5

so the th an ths denomination, i. e. the third nism being in that rest position in which no value v 5 Figure 1 shows an elevation in perspectiv f a and the control mechanism of the shifting mecha- 35 manna an. 1, 1941 t i 2 123,035

UNITED STATES PATENT orr ca DEVICE OF I August Friedrich Pott, Zella-Mehlil, Germany, asaim to Mercedes Biiromaschinen-Werke Aktiengesellachaft, Zella-Mehlis, Germany Original application August 8, 1935, Serial No. 35,389. Divided and this application April 11, 1936, Serial No. 73,963. In Germany April 30,

6 Claims. (Cl. 235-73) The invention relates to a device for the aplator. viewed from the front on the left hand side proximation of a value in one denomination of of the machine. 1

- an accumulator for calculating machines of the Figure 6 shows a centre section through the type disclosed in my copending application Ser. machine according to Fig. 1. in which various of present application is a division. Said' device sake of better comprehension, are repr comprises a gear drive and is actuated in dewith dotted lines and the amount storing means pendence on an operation of the operating means is represented in its inoperative position. for the'resetting of an amount storing means. Figure '7 shows in perspective the, individual The gear drive automatically adds in five units elements of the amount storing means drawn out 10 to the appertaining denomination, thereby addnon one another and viewed in the same direcing through the intermediary of the tens trans: tion as in Fig. 5. fer means one unit to the next higher denomina- Figure 8 shows a part section according to Fig. tion, provided that the denomination, associated v6 with the amount storing means, in the working with said gear drive, shows already a "5? or any position. Y 15 number greater than 5." In commercial trans- Figure 9 shows an elevation in perspective of actions it is customary to increase the hundredths the shifting mechanism arranged within the madenomination, that is the second place to the chine on the right hand side for the amount right of the decimal point through one unit if in storing means and totalling device, the mechaplace to the right of the decimal point a 5 apin n the amount StOrinE means. pears or a number greater than "5." This ap- Figure 10 shows a similar elevation to Fig. 9, proximation which has particular application to but in that rest position in which a value is contrading in merchandise when multiplication is to tained in the amount storing means 2 be carried out, for instance 'with marks and Fi u e 11 shows in pe pe tive e o p 0! pfennigs, according to the invention is effected vers indicated in Figs. 9 and 10, the l v b61118 automatically so that an additional deliberation drawn out from one another for P p of on the part of the operator is unnecessary. lu rati n- In the drawings one form of the invention is' Figure 12 shows a side elevation of the device ilillustrated by way of example. lustrated in Figs. 9 and 10 the position of the 3 Figures 1 to 1'? illustrate well known mecha- P r s being Somewhat c fl nisms and are merely included in the speciflca- Figure 13 S ow t Sa w as F 12 a t tion for a better understanding of the invention instant, however, in which after depression of the pr per. total key, the driving connection between the key calculating machine with which the invention by s ut is released through e d iv moves way of example is designed to be incorporated. ment of the some.

Figure 2 shows a view of the main drive shaft Figure 14 shows a perspective representation of with the carriage shift clutch, the clutch for the the parts arranged within the machine on the left differential actuating mechanism and the resetting hand side and viewed from the front left hand 40 clutch, viewed in the direction of the arrow 52 side of the machine.

shown in Figure 1. Figure 15 shows in perspective a detail of Fig. Figure 3 shows a perspective view, taken from 14. 1 a

the right hand front of the machine of the keys Figure 16 shows a fragmentary longitudinal for the accumulator and revolution counter resection of some details of Fig. 14.

setting device in which the resetting clutch for Figure 1'7 shows in perspective the three right the sake of clearness is drawn out of its true hand wheels sets of the accumulator and the position towards the right. amount storing means as viewed from the rear Figure 4 shows a longitudinal section through of the machine.

the carriage and along the lines lit-4a. 4b.-4b Figure 18 shows a perspective of the amount 50 and lc4c in Figure 6 viewed in the direction of storing means provided with an approximation the arrow I21. device.

Figure 5 shows an elevation in perspective of a Figures 19 and 20 show two different views of a part of the amount storing means as well as the detail in perspective representation, Fig. 19 showresetting device for the sale II he aocumuing the wheel for measuring of! the live units, on 55 an enlarged scale viewed from in front of the machine and Figure 20 shows the same wheel viewed from the rear of the machine. 7

Figure 21 shows a perspective representation of the resetting members modified according to the invention, the parts for purposes of illustration being separated from one another.

Figure 22 shows an elevation according to Fig. 18 on an enlarged scale, with the resetting memher in the working position of the same after the completed transfer of the five units for the approximation.

Figure 23 shows a plan of the resetting member.

Figure 24 shows a section according to the line 2424 in Fig. 22 viewed in the direction of the arrows at said line.

Figure 25 shows a device for cutting out the approximating device at will.

Figures 26 to 32 show diagrammatically the positions of the register carriage for the example of calculation hereinafter mentioned.

Operation for entering a value into the amount storing means For the sake of a better understanding of the present invention it seems advisable to briefly set forth the operation for entering a value into the amount storing means I (Figs. 5, 6, 8, 14, 18).

In Fig. 1, RC indicates the revolution counter, A the accumulator and K the keyboard of the machine.

In order now to enter a value, which stands already in the accumulator A (Figs. 26 to 32) into the amount stornig means I (Figs. 5, 6 and 14) it is only necessary to depress the total transfer key 3 (Figs-l, 9, 10, 26). On the depression of the total key 3 (Fig. l) the following operations take place.

The key lever 4 (Figs. 9,. 10) is swung in the anti-clockwise direction. Hereby the shaft 5 the crank arm 6 of which is embraced by the fork I of the key lever 4, is swung in the clockwise direction and with it the lever 8 (Fig. 14).

The rod 9 jointed to the lever 8 is displaced in the direction of the arrow I0 whereby through the recess I I engaging with the pin I2 of the threearmed lever I3, the lever I3 is swung in the anticlockwise direction, consequently the toothed segment I4 of the same rotates the toothed wheel l5 and the crank arm I6 fixed to it in the clockwise direction. Consequently, the rod I1 is drawn downwards and swings the arm I8 fixed to the amount storing means I and therewith the amount storing means I itself in the clockwise direction, so that the amount storing means I is swung from the position represented in Fig. 6 to the position represented in-Fig. 8, in which the wheels I9 are in engagement with the toothed wheels 28 fixed on the numeral wheel shafts 2|, so that when the numeral wheels 22 and therefore the numeral wheel shafts 2I are .IOW returned to zero, a transfer of the value from the accumulator A to the amount storing means I takes place.

After the wheels I9 therefore are in engagement in this manner with the wheels 28 fixed on the numeral wheel shafts 2| according to Fig. 8, the actual transfer of the value from the accumulator A to the amount storing means I will be hereinafter described in detail.

On the swinging of the key lever 4 in the anticlockwise direction resulting from the depression of the total transfer key 3 (Figs. 9 and 10) the rod 23 is drawn forward in the direction of the arrow I 0. The lug 24 of the retaining hook 25 then runs upon the incline 26 of the fixed projection 21. Consequently the retaining hook 25 is swung round the screw 28 in the clockwise direction against the action of the spring 29 and as the nose 38 of the retaining hook 3I which is also swingable around the screw 28 rests on the lug 32 of the retaining hook 25, the retaining hook 3I is also swung in the clockwise direction. The incline 26 of the projection 21 is so dimensioned that the two retaining hooks 25 and 3I are swung so far in the clockwise direction in Fig. 9 that the recess 33 of the retaining hook 3I embraces the arm 34 of the rod 35 after a short movement of the rod 23 in the direction of the arrow I0, whereby naturally between the nose 36 of the retaining hook 3|, and the nose 3'! of the member 38, a corresponding amount of play has taken place. On the further forward movement of the rod 23 in the direction of the arrow ID, the lug 24 of the retaining hook 25 runs along the straight upper face of the projection 21, whereby the engagement of the recess 33 of the retaining hook 3I with the arm 34 is secured positively as long as the total transfer key 3 is held depressed, i. e., the lug 24 of the retaining hook 25 does not leave the upper face of the projection 21 towards the right. During the passage of the lug 24 along the straight upper face of the projection 21, the rod 35 is consequently taken along with it in the direction of the arrow I0.

Hereby the rod 35 rocks the lever 39, as viewed in Figure 3, in the clockwise direction, whereby on the one hand, the motor contact 48, H and the resetting clutch 42 are closed which latter operates the rod 43, whereas on the other hand, the part 44 (Fig. 3) of the lever 45 engages with the adjacent recess 46 (Figures 4 and 5) of the resetting bar 41, 48 so that the latter is moved by the part 44 through the parts 50 and 5| interconnected with the rod 43, in the direction of the arrow 52 indicated in Figs. 5 and 4.

Consequently all the toothed wheels 53 (Fig. 5) are rotated in the anti-clockwise direction while the wheels 54 of the numeral wheel shafts 2| which are not at zero together with the numeral wheels 22 are rotated so far in the clockwise direction that the zero spaces 55 of the wheels 54 he opposite the resetting wheels 53, in which position the numeral wheels 22 are at zero.

As however, the wheels 20 fixed on the numeral wheel shafts 2 I as above mentioned, are in engagement with the wheels I3, the value contained in the accumulator A is transferred to the wheels IS in the anti-clockwise direction.

This bringing in operation is of course only effected after the engagement of the wheels I8 with the toothed wheels 20 is secured by the parts represented in Fig. 14.

During the movement of the rod 43 (Fig. 9) the same moved upwards against the arm 56 and has thereby swung the lever 38 from the position according to Fig. 9 Into the position according to Fig. 10, whereby the same points to the mark S and thus indicates that a value is contained in the amount storing means I.

When the total transfer key 3 is released the rod 23 (Fig. 9) moves in the direction of the arrow 51 under the action of the springs 29 and 58 (Figs. 9 and 14) back into its rest position and with it the rod 35 whereby the resetting clutch 42 is again opened and the above mentioned driving connection between the rod 43 and the resetting bar 41, 48 is again broken. Besides, the lug 24 of the retaining hook 25 again slides along on the straight upper face of the projection 21 and as soon as it falls down to the left of the projection, the conescapes nection at 33, 34 is released through the swingin movement of both of the retaining hooks 3i and 25 in the anti-clockwise direction owing to the action of the spring. of the retaining hook 23 runs up on the lug 80 of the lever OI. As the spring 23 attached to the retaining hook II is weaker than the springs 62 and 33 engaging with the levers CI and 84, the retaining hooks 25 and 3I, on the sliding of the inclined edge II up on the lug of the lever SI, are first swung somewhat in the clockwise direction which is without importance.

As soon as the rod 23 has returned to its rest position, represented in Fig. 10, the spring 29 connected to the retaining hook 3I comes into operation'and swings the retaining hooks II and 25 into the position represented in Fig. 10, in which position the recess 8! of the retaining hook 25 snaps over the lug 30 .of the lever 6|.

The retaining hooks 3| and 25 can swing freely into the position represented in Fig. 10, owing to the fact that the nose 31 of the member 38 offers now no resistance to the nose 36 of the retainin hook 3I'. The end 63 of the retaining hook 25 then lies against the pin 61 of the rod 23 in order to permit some play between the recess of the retaining hook 25 and the lug 60 0f the level 6|.

By the release of the total transfer-key 3 the parts I, U (Fig. 14) 9, I3, I4, It, II, II, I3 have returned to their normal position represented in Fig. 14.

Operation of the transfer of a value from the amount storing means to the accumulator To that end, it may be assumed that the accumulator A displays an item.

If it is dedred to obtain the sum of this item and of the item contained in the amount storing means I, it is only necessary to depress again the total transfer key 3. In this case, however the item displayed by the accumulator A is not transferred to the amount storing means I but the item contained in the amount storing means I is added to the item standing in the accumulator A by seroizing the wheels I3.

This comes to pass in the following manner.

As soon as a value is present in the amount storing means I, the parts located on the right hand side of the machine, assume the position represented in Fig. 12 while the parts (Fig; 14) located on the left hand side of the machine always take up one and the same rest position.

If now the total transfer key 3 is depressed to begin with the amount storing means I is swung out of the position according to Fig. 6 into the position according to Fig. 8 through the parts 3 (Fig. 14), a, II, I2, I3, I4, I3, It, I1 and I3 in the manner already described. above.

On depression of the total transfer key a, the in the direction of the arrow III rod 23 is moved (Fig. 10).

In the movement ofthe rod 23 in the direction of the arrow II, the recess SI of the retaining hook-23 takes the lug 33 of the lever I along with it in the direction of the arrow I3, whereby the lug 24 of the retaining hook 2| slides along the, the under side of the projection 21 so that, as long as the total transfer key 3 is held depressed, the engagement of the recess 03 of the retaining hook 23 with the lug 33 of the lever II is ensured by the projection 21, i. e. the lug 23 of the retaining book 23 does not leave the projection in the movement towards the right. Accordingly the threelevers 3|, N, and 33 (Fig. 11) are swung together round the screw 63 in the anti-clockwise direction. In this inovementthe pm I! of the Further, the inclined edge 59 lever II slides up on the upper inclined edge of the nose I2 (Fig. 11) of the slot 13 of the lever 03. At this moment, the clutch lever II has already been displaced so far through the pin II, the lever .II and the shaft 15, that its I! 1 (Fig. 9) lies swung in the anti-clockwise direction and with it also the clutch lever I4. This now releases the pawl 19 of the coupling for the differential actuating mechanism whereby this clutch is closed. By this release of the pawl 19, the pawl N2 of the carriage shift clutch I13 is'further held in its inoperative position by the lever 14 so that the carriage shift clutch cannot be operated. Consequently through the wheel 3| (Figs. 2, 9 and 14) not only the wheel 82 and the driving shaft 83 for the differential actuating mechanism are rotated but also the tens carrying shaft 84 is driven in the direction of the arrow by means of the wheels 32, 36 and 31. Further, the lug 80 (Fig. 10) of the lever Si in consequence of its swinging movement in the anti-clockwise direction (the lug 60 being thereby raised somewhat), has swung the retaining hooks 25 and II, so far in the clockwise direction against the action of the spring 29 that they again take up the horizontal position represented in Fig. 12. which, in consequence of the corresponding formation of the lower face of the projection 21, they are capable of freely doing. 7

In the swinging movement of the levers 68, BI and 8.4, around the screw 68 in the anti-clockwise direction, the horizontal arm of the lever 64 10) moves along the upper face of the projection 83 whereby in consequence of the yielding arrangement provided by the spring 63 engaging with its lug 89, the lever 64 is permitted to swing somewhat in the clockwise direction round the screw and directly after leaving the projection 38 is swung under the action of its spring 63 in the anti-clockwise direction and so as to lie in front of the projection 88 as shown in Fig. 12, whereby even if the total transfer key 3 should be prematurely released, cannot spring upward, because the parts 33, 64, SI, 61), 65, 25, 28 as positioned in Fig. 12 hold the rod 23 displaced in the direction of the arrow I I and therefore the key 3 will be held in depressed position.

Further, it has been mentioned above that the tens ca y g shaft 34 (Fig. 14) rotates in the anti-clockwise direction by the closing of the clutch 30 for the differential actuating mechanism. However, on depression of the total transfer key 3, the three armed lever I3 (Fig. 14) was swung in the anti-clockwise direction. On the swinging movement of the three-armed lever I3 the roller OI (Fig. 14) of the lever I3 acted on the inclined face 32 of the lever "and swung this lever in the anti-clockwise direction, whereby the horizontal arm 34 of the lever 33, by means of the pin ll of the angle lever 96 swings the angle lever in the clockwise direction (Fig. 16). Consequently, by means of the upwardly projecting fork arm 31 of the lever 96 the element consisting of the parts as, to IIII on the tens carrying shaft 34, is displaced lnthe direction of the arrow 32 whereby the pin 93 of the element 93, 3! to III releases the pin wheel III2 and the arm I03 of the angle lever 36 secures the same against rotational displacement. At the movement of the parts 93, ll, II to III thecam III comeainthepathoftheroller III of the lever I". Now, as the cam III is locatedinthepathoftheroller Illitactsonthe roller Ill, whereby the parts III, III and III are swung in the clockwise direction. The angle lever I" is therefore likewise swung in the clockwise direction so that the rod Ill and with it the resetting bar III are displaced in the direction of the arrow 52. By this means, all the resetting wheels III are rotated in the anti-clockwise direction (Figs. 14 and 5). Consequently, those wheels I! which do not stand at zero, are returned to zero in the clockwise direction and as they are in engagement with the toothed wheels 20, fixed to the numeral wheel shaft II, the wheels together with the shaft II and the attached numeral wheels 22 are rotated in the anti-clockwise direction, whereby the item contained in the amount storing means I is added to the item, standing in the accumulator A. If for instance, in consequence of the addition of 5 both items, a tens transfer takes place in the second calculating place from the right, the tens transfer is only prepared by the nose II! (Figs. 6 and 8) of the wheel H3 of the second numeral wheel shaft H from the right by moving the preparatory member I I4 forward in the direction of the arrow I21. I

Before, however, the tens transfer so prepared can be executed, it is necessary to return the amount storing means I into its inoperative position represented in Fig. 6, as otherwise breakage of a tooth may take place since the wheels I9 already standing at zero in consequence of the striking of their projections IIS (Fig. '7) against the pins H6, are prevented from a further clockwise rotation as would arise from a tens transfer. This is avoided in the following manner:

In the resetting of the amount storing means I the tens carrying shaft 84 (Fig. 14) has rotated so far that the edge III of the disc H8 5 fixed on this shaft has operated the roller II! of the lever I3. As a result, the lever II which is still with the upper end of its rack II in engagement with wheel I5, is now rocked in the clockwise direction which it can do freely, as

shortly before the parts I05, I06, Ill were swung by the cam "II in the clockwise direction and therefore the pin MI! of the lever IIII by acting on the end III of the rod 8 has raised the recess II of the said rod from the pin I! of the lever I3.

. By the swinging movement of the lever II in the clockwise direction, the amount storing means I is moved into its inoperative position as represented in Figs. 14 and 6 in the manner already described through the parts II, I, I1 and I8, whereby the end III of the rod 0, which is still held displaced in the direction of the arrow III (Fig. 14) rests on the pin I2 of the lever II, while the roller II! of the lever I3 runs along on the concentric part ofthe cam iii.

65 By the swinging movement of the lever I3 in the clockwise direction the roller ll, however, has also released the lever I, so that this is now under the action of its spring I22 but cannot yet swingin the clockwise direction for the ML 7 lowing reasons. The tensioned spring I22 (Figs.

14 and 15) tends to rock the lever IS in the clockwise direction. Accordingly its arm I4 tends to rock lever 96, 91 (Fig. 16) from its position shown in dotted lines in Fig. 16 to the position shown in 7 solid lines which however is not possible, since pin ll of the element ",1", III, cannot enter the hole in the right hand side disc I of pin wheel III, until the element I8, I", IlI has performed a complete revolution. Consequently, also lever 83 is not permitted to rock clockwise. 5

Immediately after the amount storing means I has again taken up its rest position illustrated in Fig. 6, the tens transfer process takes place by raising, by means of the eccentrics III attached to the tens carrying shaft 84 (Fig. 14), all the 10 tens carrying members III (Fig. 6). As now only the preparatory member H4 in the tens denomination was displaced in the direction of the arrow I21, so by the upward movement of its associated tens carrying member I26, the lat- 15 ter is swung to the left, whereby the numeral wheel 22 of the hundredsdenomination is rotated one unit further. Consequently the transference from the amount storing means I to the accumulator A and the totalling of the both items 20 are completed. Now, the mechanisms should be returned to their rest position and in doing so, caremust be taken that no second rotation of the drive shaft 83 for the differential actuating mechanism is brought about. 25

This takes places in the following manner:

Before completion of the first complete revolution of the tens carrying shaft 84, the strip I28 (Fig. 12) fixed on the right hand end of this so shaft engages the end I of the lever I. In Fig. 13 is shown the position at the moment when the lever BI is being swung by the strip I28.

By the engagement of the strip III with the upper end of the lever I, the lever CI is swung as against the action of the spring 62 connected to it, in the clockwise direction round the screw 08 (Fig. 11) of the lever 68 and, of course, approximately for an amount represented by the length of the slot I30. The lug (Fig. 13) is 0 thereby withdrawn from the recess of the retaining hook 25. Its arm Iii acts on the lu In of the member 38 and swings the same out of the position according to Figs. 12 and 10 and into the position according to Figs. 13 and 9 u in which latter position the member II again points to the mark C (Fig. 10) and indicates to the operator that no value is contained in the amount storing means I, therefore the amount storing means I is reset. 50

In the swinging movement of the lever 6| in the clockwise direction (Fig. 13) it acts also on the lug 89 of the lever 64 and swings the latter likewise in the clockwise direction against the action of the spring OI, whereby the arm of the u lever it releases the projection 88 as is represented in Fig. 13. As at this moment the strip in of the tens carrying shaft OI still acts on the upper end In of the lever I, the spring 82 acting on the lever I can now come into opera- .9 tion. As the pull of the spring 02, by means of the screw ll is transmitted to the lever It, the latter is swung roimd the screw 6| in the clockwise direction. In this movement, the horizontal arm of the lever, N again'extends over the proas iection I. (Fig. 10) and the lever 68 is drawn against the projection ll whereby the right hand endoftheslotlllofthelevertl alsocomesto rest on the pin in of the lever I.

At this juncture the pin ll of the lever II has 70 also again slid out of the slot I8 of the lever ll according to Fig. 10, so that this latter lever, and with it the shaft II and the clutch lever ll under the action of a.spring (not illustrated) again take up their rest position in which the clutch I 39 for the differential actuating mechanism is opened and thus only one revolution could be performed.

Finally after the completed revolution of the 5 tens carrying shaft 84 (Fig. 14) the pin 99 under the action of the spring I22 has again entered the hole of the righthand side disc I24 of the pin wheel I32 and has again coupled this with the tens carrying shaft 34.

Moreover, the cam Ill has again been brought From the foregoing it may be seen that on the depression of the total transfer key 3, the accumulater A is coupled with the amount storing means I andtheaccumulatorAisaeroizedbytherack 43 (Fig. 4) according to which the amount standing-in the accumulator A is transferred to th amoimt storing means I.

If the total transfer key 3 is again depressed the accumulator A is also coupled with the amount storing means I, but now the amount storing means -,I is zeroized by the rack IIII (Fig. 14) transferring thereby the amount from the amount storing means I to the accumulator A and adding such amount to the amount eventually ritesent in the accumulator A.

Accordingly. the repeated actuation of the total transfer key 3 transmits alternatingly amounts from the accumulator A to the amount storing means I and vice versa.

After this brief description of the known mechanism of the machine disclosed by my above mentioned copending application Ser. No. 35,389, the invention proper will now be described in detail, the object of which is to eliminate decimals while transferring from the amount storing means I to the accumulator A.

Decimal approximating mechanism If it is desired to approximate the last re i tered digit that is that digit which is opposite the units denomination wheel I9 of the 45 amount storing means the following mechanism is provided.

To the right of the units denomination wheel I9 (Fig. 18) there is arranged a lo-toothed wheel I34 of the same size as the wheels I9. This 50 wheel I34 is provided with stops similar to the stops 135 (Fig. 'l) of the wheels I9 with which stops a ball I36 (Fig. '7) engages arranged in a hole of the strip I31 and acted upon by a blade spring I33. In contradistinetion to the remaining wheels I9, the wheel I34 has neither a zero projection II5 (Fig. '7) nor a partly enlarged tooth space ll5a formed by removing half of the breadth of the tooth. Below the toothed wheel I34, an additional wheel I39 (Fig. 18) is arranged. In the rest position .of the resetting bar N0, the toothed wheel I39 is so located, that the enlarged tooth-space I49 (Figs. 19 and 20) formed by the removal of half the breadth of a tooth, lies opposite to the toothed wheel I34, and does not prevent the wheel I34 from freely rotating in the working position of the amoimt storing means I. The resetting bar-I III (Figs. 18,

21 and 22) is provided at its right hand end with a straight projection I4I equal in height to the teeth of the resetting bar I III. The toothed wheel I39 (Figs. 19 and 20) has, on the opposite side'to the tooth-space, above described, three flattened-off teeth I42, I43, and I44 of which theteeth I42 and I44 areonlypartiamflattmed 75 off, while the tooth I43 is completely flattened of! with regard to its tooth-thickness. In the rest position of the resetting bar IIII, the-three flattened off teeth, I42, I43 and I44 rest on the projection I of the resetting bar H9 and thereby prevent an unintentional rotation of the wheel I39. On the resetting bar IIII (Figs. 18 and 21) a small rack I45 is slidably attached by means of pins I45 and I41. To the pin I43 of the resetting bar I I9, a draw spring I49 Is attached and draws the bar I45 by means of its spring hook I59 to the right, so that thebar I45 contacts with the guide pin I41. In this position the teeth of the resetting bars H and I45 are in. register. At II (Fig. 21) two teeth are removed from the resetting bar IIII and into the space thus formed project two laterally extended teeth I52 and I53 of the bar I45. The aim of this arrangement will be described later in detail.

If the resetting rack I III in the cancelling operation of the amount storing means I, resulting from depression of the total transfer key 3 (Fig.

A is moved from the normal position (Fig. 18)

towards the right (Fig. 22) the small bar I45 is likewise moved to the right along with the rack III. In this movement towards the right of the resetting bar III), the toothed wheel I39, to commence with, remains at rest until the first tooth I54 (Fig. 21) of the small bar I45 presses on the half-breadth tooth I43 of the toothed wheel I39. The toothed wheel I39 is thereby rotated in the anti-clockwise direction through 5 /2 tooth divisions (see Fig. 22). The toothed wheel I34 at the same time is rotated through five teeth in the clockwise direction. The pin I55 (Fig. 21) of the bar I45 at this point abuts against the bearing member I56 (Fig. 22) located on the rear wall whereby the movement of the rack I45 is limited. As manufacturing difiiculties arise in producing the resetting bar IIII exactly dimensioned in this manner, the resetting bar II, as is shown in Fig. 22 is permitted to move to the extent of half the width of a tooth farther with regard to the small bar I45. The tension spring I49, which connects the two bars III! and I45 is thus tensioned. The wheel I39 is, however,

not rotated further, for in this position the teeth I52 and I53 which are extended laterally of the bar I45, and project within the wider tooth space I5I (Figs. 21 and 23) which as already mentioned is formed by the removal of two teeth-from the resetting bar I III engage with the wheel I39. The other resetting wheels III, on the contrary, during the above mentioned extended movement of the resetting bar III], are inoperatively rotated furtherthrough half of one tooth division, which can happen unimpeded, since at that time the wheels I9 of the amount storing means I have rotated back to zero and in this position of the wheels I9, the wider tooth space I53 formed by the removal from a tooth of half its breadth, lies opposite to the resetting wheels III and permits their free passage therethrough.

By the rotation of the toothed wheel I34 in the clockwise direction,'however, the corresponding wheel 29 (Fig. 18) which stands opposite to it, together with the numeral wheel shaft 2| rigidly connected to it and the numeral wheel 22 are rotated anti-clockwise. If prior to the rotation of the wheel I34 in the clockwise direction, there stands on the numeral wheel 22 which is just in driving connection with the wheel I34, e. g., the number 5, or a greater number than "5," then the corresponding numeral wheel 22 is rotated from "5 over "6," "'7, etc., to 0.- Accordingly, while rotating from 9" to "0 a tens transfer is brought about by the parts H2, ill, I26, I59 (Figs. 6 and 8) to the numeral wheel 22 of next higher denomination, whereby the digit in this denomination is increased by "l." In the following numerical example, the manner of operation is once more illustrated.

It may be assumed that the product 1.9584 stands in the accumulator A.

As mentioned above, it is usual only .to calculate 10 whole pfennigs amounts, and consequently the product is approximated in the second place after the comma. To this end, the carriage I ill is brought to the position represented in Fig. 26, in which, therefore, the numeral wheel 22 of the tens denomination of the accumulator A which shows the number 8 of the product 1.9584 lies opposite to the wheel I34 of the amount storing means I (Fig. 18.) The broken line I6I- ISI shows in Fig. 26 the regular position of the 2G lowest decimal place of the amount storing means If it is desired to directly approximate the product standing in the accumulator, care should be taken that prior to the multiplication the an amount storing means I is at zero and that the hook unit 3!, assumes the Fig. 10 position.

If the amount storing means I is not at zero and the hook unit 3I, 25 assumes the Fig. 10 position, the total transfer key 3 is depressed 39 whereby as has been pointed out, the amount storing means I is zeroized, its amount is transferred to the accumulator A and the hook unit 25 is shifted to the Fig. 9, position. Thereupon the accumulator A is zeroized by depression of the key I8. In order to shift the hook unit again to the Fig. 10 position, the total transfer key 3 is depressed. As however, the accumulator A is already at zero, no transfer to the amount storing means i takes place, that is to say, the latter re- 4.0 mains at zero while the hook unit 3i, 25 assumes again its Fig. 10 position.

After this manipulation has been made, the multiplication process is performed, after which the accumulator A displays the product 1.9584

and the carriage I66 assumes the position illustrated in Figs. 26 and 18, that is to say the tens denomination of the accumulator A is opposite the wheel I34.

If new the total transfer key 3 is depressed a resetting operation of the amount storing means I takes place in which the resetting bar III and with it the small bar I are moved to the right (Fig. 18). The resetting wheels III thereupon rotate in the anti-clockwise direction, and after theiiat part I of the bar III has passed along the short teeth I42 to I (Fig. 20) likewise the toothed wheel I3! is rotated. As in the amount storing means I, no value is present, the numeral wheel shafts 2I the numeral wheels 22 respectively are not rotated further with the exception of the numeral wheel 22 of the tens denomination in which by rotation of the'toothed wheels I35 and I a 5 is added whereby the "8" is changed to "3 (Fig. 27). As in this movement of the numeral wheel 22 of the tens denomination, the' "9ispassed throughatenstransferiseftected through the intermediary of the parts II2, Ill, I26 and I5! to the numeral wheel 22 of the hundreds denomination, whereby the "5" on this mnneral wheel is changed to a "6." Accordingly, as the numeral wheel of the units denomination has remained unaffected, the value 1.9634 (Fig. 27) is now disp ayed in the accumulator A. If now, the indication of the last two mnneral (I whee1s22 totherightistakenoutofconsideration,

thevalue"1.96isthetedvalueof 1.9584.

If, however, it is desired to store the value "1.96 in the amoimt storing means I it is only necessarytodepressthetotalh'ansferkeyls whereby the accumulator A is reset. Thereby the 4 in the units denomination of the accumulator A gets lost, because no wheel of the amount storing means I is opposite that denomination. The "3 in the tens denomination is transferred to 10 the wheel I30, whereas the value 1.96" is transferred to the corresponding wheels 20 of the amount storing means I.

Now it may be assumed that a new product, for instance, 26.02360 (Fig. 28) stands in the accumu- 15 later A and that the carriage is already in the suitable position. If now the total transfer key I is depressed, the first value 1.96 contained in the amount storing means I, is added to the product 26.02360 standing in the accumulator A with the 20 bringing in of the additional "5 in the following manner.

26.02360 product standing in the accumulator A (Fig. 28) r u 1.96

27.98860 (Fig. 29)

It has been pointed out that in the transfer of the product 1.9634 9. "3 was transferred to the wheel I34. This is however without any importance, since the wheel I 34 has no zero space which could co-operate with the zero space I" of the wheel I39. Therefore, the wheel I34 serves merely 35 as an intermediary wheel and not as an amount storing wheel as to the wheels 20. Accordingly in any transfer from the amount storing means I to the accumulator A, the multilated wheel I" transfers always a 5 regardless of the actual 40 position of the wheel I34.

Consequently as the numeral wheel 22 of the hundreds denomination of the accumulator A in the last product displays a 3" (Fig. 28) a "5" is added so that this wheel displays an "8" as is 45 evident from Fig. 29. Accordingly, no tens carrying movement takes place to the thousands denomination which with regard to approximation purposes is correct.

By depression of the total transfer key 3, the 50 value 27.98 now comes into the amount storing means I whilethethreelastdechnals860"disappear.

The third product may be 1.938 standing in the accumulator A. The register carriage I is in 55 the position according to Fig. 30.

Now,thetotaltransferkey2isagaindepressed, whereby the value 27.98 contained in the ammmtstoringmeanslisaddedtothevalue, 1.938 standingintheaccumulatorAwiththe" b inging-1n of the additional 5 in the following manner.

1.938 Value standing in the accumulator A (Fig. 30)

2'l.98 Value oontainedinamormtstoringmeans amount storing means I while the 3 in the third decimal place to the right of the decimal point disappears.

The carriage I69 is now moved into its extreme left position, and the total transfer key 3 is again depressed, whereupon the value 29.92 (Fig. 32) appears in the accumulator A. In this operation no 5" is brought in by the wheel I39, as in the extreme left position of the carriage I60, none of the wheels 29 or numeral wheels 22 lie opposite to the wheel I34. v

There is therefore in the transfer from the amount storing means I to the accumulator A always a "5 brought in by the wheel I39 into the denomination lying opposite to it.

As this,,occasionally is undesirable, in Fig. 25,

a construction is shown in which the wheel I34 may be disconnected at will;

To this end, the part I31 of the amount storing means I, is provided with a yoke like recess I64. Into this part I31 a pin I66 is riveted. On the same a sleeve I66 is rotatably, and slidably mounted, and is likewise rotatably and slidably mounted in the part I61. On the sleeve I66, the wheel 34 and a knob I66 are attached. The sleeve I66 is provided with two ring grooves I69 and I with which a wire spring I1I attached to the part I61 may engage, so that the sleeve I66 and with it, the wheel I34 may be held in the desired position.

If the spring "I engages with the groove I19, the wheel I34 does not engage with the wheel I39 and consequently no transfer of five units to the accumulator A results. If, on the contrary, the sleeve I66 with the wheel I34 is displaced so that the wire spring IN is in engagement with the groove I69, the wheel I34 engages with the wheel I39 and consequently a transfer of 5 units to the accumulator A is efiected. In order to secure the wheel I34 against rotation in its position for the time being, instead of a ball I36 on the part I31 a stop spring, not illustrated, may be employed, which directly coacts with the teeth of the wheel I34 in both positions, and thus secures it. g

I claim:

1. In a calculating machine, having an an accumulator, amount storing means, a transmission gearing between said accumulator and said amount storing means, movable resetting means for said storing means including an operating member, a manipulative member for coupling said amount storing means with said resetting means, a clutch for operating said resetting means, the combination of a geardrive operable by said operating member to effect a decimal approximation in the desired order of the accumulator when actuating said manipulative member, said gear drive including a gear wheel and a mutilated gear wheel cooperating with the first mentioned sear wheel, a drive member for said mutilated gear wheel actuated by said operating member, and means on said drive member cooperating with the mutilated gear wheel to lock the latter in its rest position and during the first part of movement of the operating member of the resetting means.

2. In a calculating machine, having an accumulator, amount storing means, a transmission gearing between said accumulator and said amount storing means, movable resetting means for said storing means including an operating member, a manipulative member for coupling said amount storing means with said resetting means,

approximation in the desired order of the accumulator when actuating said manipulative member, said gear drive including a gear wheel a mutilated wheel adapted to cooperate with the first mentioned gear wheel, and a drive member for said mutilated wheel slidably connected with and actuated by said operating member.

3. In a calculating machine, having an accumulator, amount storing means, a transmission gearing between said accumulator and said amount storing means, movable resetting means for said storing means including an operating member, a manipulative member for coupling saidamount storing means with said resetting means, and a clutch for operating said resetting means,

the combination ofa gear drive to effect a decimal approximation in the desired order of the accumulator when actuating said manipulative member, said gear drive including a gear wheel,

a mutilated wheel. adapted to cooperate with the first mentioned gear wheel, and a drive member for said mutilated wheel slidably connected with and actuated by said operating member, and a locking surface on said member coacting with the mutilated part of the mutilated wheel to lock the .latter in rest position and during the first part of movement of the resetting means.

4. In a calculating machine, having an accumulator, amount storing means, a transmission gearing between said accumulator and said amount storing means, movable resetting means for said storing means including a rack bar, a manipulative member for coupling said amount storing means -with said resetting means, and a clutch for operating said resetting means, the combination of a gear drive to efiect a decimal approximation in the desired order of the accumulator when actuating said manipulative member, said gear drive including a gear wheel, a mutilated wheel adapted to cooperate with the first mentioned gear wheel, a rack for driving said mutilated wheel and being slidably connected with and actuated by said rack bar, a locking surface on said rack bar cpacting with the mutilated part of the mumeans with said resetting means, and a clutch for operating said resetting means, the combination of a gear drive to efifect a decimal approximation in the desired order of the accumulator when actuating said manipulative member, said gear drive including a gear wheel, a mutilated wheel adapted to cooperate with the first mentioned gear wheel, a rack for driving said mutilated wheel and being slidably connected with and actuated by said rack bar, a locking surface on said rack bar coacting with the mutilated part of the mutilated wheel to lock the latterin rest position and during the first part of movement of the resetting means, certain of the teeth of the rack bar being removed to form a space, the teeth of the driving rack adjacent said space projecting laterally to said rack and occupying said space, a spring normally retaining the teeth of the driving rack in line with the teeth of the rack bar, and

actuating said manipulative member, said gear drive including a.gear wheel, a multilated wheel adapted to coop rate with the first mentioned gear wheel, a rack for driving said mutilated wheel and being slidably connected with and actuated by said rack bar, a locking suriace on said rack bar coacting with the mutilated part or the mutilated wheel to lock the latter in rest position and during the iirst part of movement oi the resetting means, said mutilated wheel having one tooth shortened across its entire width and the two adjacent teethmutilated and having a m 10 space opposite said mutilated teeth disposed in the space of the rack.

AUGUST FRIEDRICH PO'I'I. 

